To troubleshoot the issue where the user_id is returning NULL, you can follow these steps:

1. Ensure User Authentication: Make sure that the user is authenticated before reaching the createWebhookSubscription method. If Auth::id() is returning NULL, it typically means the user is not authenticated.

2. Middleware: Ensure that your route is protected by authentication middleware. This will ensure that only authenticated users can access this route.

3. Debug Logging: Add more debug logging to see where the issue might be.

4. Check Token Validity: Ensure that the token used in Http::withToken($this->bearer) is valid and not expired.

Here's a revised version of your code with additional debug logging and checks:

Controller Method

public function createWebhookSubscription(Request $request) {
    $user_id = Auth::id();

    // Debug log for user authentication
    if (is_null($user_id)) {
        Log::error('User not authenticated or user ID is null', ['user_id' => $user_id]);
        return response()->json(['status' => 'error', 'message' => 'User not authenticated'], 401);
    }

    Log::info('Authenticated user', ['user_id' => $user_id]);

    $this->deleteAllWebhooks();

    $url = "https://api.calendly.com/webhook_subscriptions";
    $postData = [
        "url" => $this->urlWebhook,
        "events" => ["invitee.created", "invitee.canceled", "invitee_no_show.created", "invitee_no_show.deleted", "routing_form_submission.created"],
        "organization" => $this->requestCurrentOrganizationUser(),
        "scope" => "organization",
        "user_data" => [
            "user_id" => $user_id 
        ]
    ];

    Log::info('Request data for creating webhook subscription', ['data' => $postData]);

    $response = Http::withToken($this->bearer)
        ->withHeaders([
            'Content-Type' => 'application/json',
        ])
        ->post($url, $postData);

    if ($response->successful()) {
        Log::info('Webhook subscription created successfully', ['response' => $response->json()]);
        return response()->json(['status' => 'success', 'message' => 'Webhook subscription created successfully']);
    } else {
        Log::error('Failed to create webhook subscription', ['response' => $response->body()]);
        return response()->json(['status' => 'error', 'message' => 'Failed to create webhook subscription'], 500);
    }
}

Route

Make sure your route is protected by authentication middleware:

Route::middleware('auth')->post('/create-webhook-subscription', [CalendlyController::class, 'createWebhookSubscription']);

Middleware in Kernel

Ensure that your middleware is set up correctly in app/Http/Kernel.php. For example:

protected $routeMiddleware = [
    // Other middleware
    'auth' => \App\Http\Middleware\Authenticate::class,
];

Debugging

If the user is authenticated and the user_id is still NULL, it could be an issue with the authentication setup itself. Check the following:

• Session Configuration: Ensure that your session configuration is correct.
• Auth Guards: Verify that the correct authentication guard is being used.

Add a debug line at the beginning of your method to see all request data:

Log::info('Request received', ['request' => $request->all()]);

Testing

To test if the authentication is working, you can add a simple route and controller method to return the authenticated user's ID:

Route::middleware('auth')->get('/test-auth', function () {
    return response()->json(['user_id' => Auth::id()]);
});

Navigate to /test-auth while logged in and ensure it returns the correct user_id.

By following these steps, you should be able to identify why Auth::id() is returning NULL and resolve the issue.